/Engine/Plugins/Experimental/PCG/Source/PCG/Public/PCGData.h
Returns spatial union of all data on a given pin, returns null if no such data exists. bOutUnionDataCreated indicates if new data created that may need rooting.
const [UPCGSpatialData](API\Plugins\PCG\Data\UPCGSpatialData) * GetSpatialUnionOfInputsByPin ( const [FName](API\Runtime\Core\UObject\FName) & InPinLabel, bool & bOutUnionDataCreated ) const